Notes

During crosslinking and excessive heating, the porphyrin films began to turn lime green; most films turned green upon entering the fixant solution composed of Na2SO4 and H2SO</sub>4</sub>.

However, the PVOH films in which two drops of HCl were added, initially started and appeared green before crosslinking.

Most PVOH 22K glutaldehyde porphyrin films had some amount of porphyrin leach out into various solutions during crosslinking. Many solutions maintained a yellow green / mantis green appearance after the removal of porphyrin films.

For this reason, after every switch or movement of a porphyrin film to another solution, a small amount (10mL) of each solution was collected for UV-Vis analysis. After crosslinking, all films were then stored in beakers full of distilled H2O.

Upon entering the distilled H2O, each film reverted back and turned pink in color again (darker pink on edges).